Apple CEO Tim Cook recently sold 511,000 shares of Apple stock for $41.5 million after taxes, according to a newly released form from the U.S. Securities and Exchange Commission (SEC).

HP shares slid 2.5 percent on Monday after Berkshire Hathaway disclosed the sale of 4,788,500 shares worth $129 million. The indirect sale was made in three separate installments between Sept. 20 and ...